X R H-4 H-5 H-6 H-7 CH3CO Solvent
O H 7.50d 7.07t 7.60t 6.92d - DMSO-d6
O Me 7.59d 7.12t 7.61t 6.91t - DMSO-d6
O Ac 7.27d 7.33t 7.70t 8.38d 2.73s DMSO-d6
C(CN)2 H 7.87d 7.12t 7.59t 6.94d - DMSO-d6
Table 2: NMR data of isatin is presented [32].